鎌

1. Origins, structure, and basic meaning

• Structure: 鎌 (かま) is a curved-blade tool for cutting grass or crops. It appears as an instrument and as the whole owning a blade.
• Basic usage: A farmer cuts grass with a sickle; afterward its blade is wiped.

2. Common pitfalls and similar expressions

• Tool used for cutting and blade maintained afterward
  • 鎌で marks means; 鎌の刃 is a whole-part relation. The second direct object is 刃, not the entire sickle.